Pole cross-arm.



0. G. BTTEU POLE 0303s ARM.

APPLICATION FILED SEPT. 18, 1911.

1 027 709. Patentd May 28, 1912.

4a.? wk; W 2 w UNITED STATES PATENT OFFICE.

CHARLES G. ETTE, OF ST. LOUIS, MISSOURI, ASSIGNOR TO ETTE INVESTMENTCOM- PANY, on ST. LOUIS, MISSOURI,

A CORPORATION OF MISSOURI.

POLE CROSS-ARM.

Specification of Letters Patent.

Patented May 28,1912.

Application filed September 18, 1911. Serial No. 649,971.

To all whom it may concern:

Be it known that 1, CHARLES G. Em, a citizen of the United States,residingat St. Louis, Missouri, have invented a certain new and usefulImprovement in Pole Gross- Arms, of which the following is a full,clear, and exact description, such as will enable others skilled in theart to which it ap-pertains to make and use the same.

This invention relates to cross-arms such as are used on poles forcarrying insulators.

Various attempts have been made to reduce the weight and increase theefliciency of pole cross-arms by using a channelshaped metalliccross-arm equipped with 1nsulator-pins. Such structures have not goneinto general use, however, owing to the high cost of manufacture and theamount of labor involved in connecting the insulatorpins to thecross-arm.

The object of my invention 1s to prov1de an inexpensive and durablemeans for supporting a large number of insulators whlch are spaced therequired distance from each other.

Briefly stated, my invention consists in a channel-shaped metalliccross-arm and insulator-pins projecting upwardly and downwardly fromsaid cross-arm and passing through the horizontal flanges thereof, saidpins being preferably formed from iron rods which can be bent easilyinto the desired shape and provided with threads for receiving fasteningdevices which prevent them from moving relatively to the cross-arm. Sucha structure is inexpensive to manufacture because the insulator-pins areformed from bar iron, preferably round rods, which can be bought in theopen market in .long lengths and severed into short sections that can bethreaded at one end to receive the insulator heads and at the oppositeend to receive the fastening devices which secure the pins to thecross-arm. Holes are punched in the flanges of the cross-arm to receivethe pins, and the pins are preferably rovided with means that preventsthem from turning or rotating in the cross-arm.

Figure 1 of the drawings is a front elevational view of a pole cross-armconstructed in accordance with my invention; Fig. 2 is a verticalsectional view taken on the line 22 of Fig. 1; Fig. 3 is a frontelevational view showing another way from that illustrated in Fig. 1 forsecuring the pins to the cross-arm; Fig. 4 is a front elevational viewshowing another way from that illustrated in Fig. 1 for preventing thepins from rotating in the cross-armg Fig. 5 is a horizontal sectionalview taken on the line 55 of Fig. 4; and Fig. 6 is a perspective view ofa portion of the cross-arm shown in Figs. 4 and 5.

Referring to Fig. 1 of the drawings which illustrates one form of myinvention, A designates a pole cross-arm which preferably consists of apiece of commercially-rolled channel iron. Said cross-arm is providedwith one set of insulator-pins 1 that project upwardly from thecross-arm, and a separate set of insulator-pins 2 that projectdownwardly from the crossarm, the set of insulator-pins 2 on the underside of the crossarm being arranged intermediate the pins 1 on the upperside of the cross-arm or in staggered relation to said upper pins. Byarranging the insulator-pins in this manner I am able to mount a largenumber of insulator-pins on a comparatively short cross-arm and stillmaintain the required distance of ten or twelve inches between theinsulators. Both sets of pins are p-referably formed from round ironrods, and the top and bottom flanges of the cross-arm are provided withholes through which said. pins pass, as shown clearly in Fig. 2. Theupper pins 1 are provided at their upper ends with heads 1 for receivingthe insulators, and said pins are bent intermediate their ends so thatthe lower portion of the pin which passes through the bottom flange ofthe cross-arm will be offset or out of 'alinement with the upper portionof the pin on which the insulator head is arranged. By forming the pinsin this manner I eliminate all possibility of their turning or rotatingin the cross-arm which, of course, is a very essential feature ofstructures of this character. The offset lower portion of each of theupper pins 1 is provided with screw-threads for receiving a fasteningdevice such, for example, as a nut 3, that bears upon the top face ofthe bottom flange of the cross-arm and thus overcomes any tendency forthe pin to drop downwardly. In arranging the upper pins in operativeposition the lower ends of same are first inserted in the openings inthe top flange of the crossarm and the nuts 3 are then screwed onto thethreaded portions at the lower ends of the pins.

The portions which project beyond said nuts are thereafter inserted inthe openings in the bottom flange of the cross-arm and the pins arelocked in position either by bend ing over the portions of the pinswhich project through the bottom flange of the crossarm, as shown inFig. l, or if desired, nuts 3 may be screwed onto the pins, as shown inFig. 3, the bent portions or the nuts 3 preventing the pins from movingupwardly. The lower pins 2 on the uncer side of the crossar1n are alsoformed fromiron rods, and they are bent or otlset intermediate theirends, as shown in Fig. 1, so that the portion of each pin which passesthrough the top flange of the cross-arm willbe out of alinement with theportion of the pin that passes through the bottom flange of thecross-arm. Said lower pins 2 are provided with arms 2" which projectlaterally and also upwardly so that the insulator heads 4 on said lowerpins will be arranged intermediate the insulator heads on the upper pinsor in staggered relation to same.

In the structure shown in Fig. 1 the crossarm is provided with teninsulator-pins, six being arranged on the upper side of the cross-armand tour on the under side of the cross-arm, but it will, of course, beobvious that the cross-arm may be provided with any desired number ofinsulator-pins without departing from the spirit of my invention.

In Figs. 4, 5 and 6 I have illustrated a structure which embodies thesame charac-' teristics as the structure illustrated in Fig. 1 but aslightly different means is employed for preventing the pins fromrotating. In the structures shown in Figs. 4, 5 and 6 the holes oropenings in the top and bottom flanges of the cross-arm which receivethe upper and lower pins are arranged in alinement with each other, andthe pins are provided with lugs 5 which project into notches or recesses6 in the flanges of the cross-arm. An opening of this character, namely,a round hole provided at one side with a recess 6, as shown in Fig. 6,can be formedabout as cheaply as a round hole because punches are usedto form the holes in the cross-arm which receive the pins. The lugs 5 onthe pins also add very little to the cost of manufacture because theyare produced by pressing or pinching the pins so as to displace aportion of the metal therein. The pins shown in Figs. l, 5 and 6 aremounted in the cross-arm in practically the same manner as the pinsshown in Fig. 1, and

when they are arranged in operative position the lugs 5 will positivelyprevent the pins from turning.

In case it is desired to have the insulators on the upper and lower sideof the crossarm arranged in alinement with each other instead of instaggered relation, the lower pins 2 can be turned so that the insulatorheads thereon will lie directly under the insulator heads on the upperpins.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

l. A pole cross-arm consisting of a member provided with horizontallydisposed flanges having a pair of openings formed in its top and bottomflanges that are arranged out of alinement with each other, and aninsulator-pin that passes through both of said openings.

2. A pole cross-arm consisting of a member provided with horizontallydisposed flanges arranged one above the other, said flanges beingprovided with openings that are arranged out of alinement with eachother, and insulator-pins passing through said flanges and providedintermediate their ends with offset portions.

3. An insulator supporting means consisting of a member provided withhorizontally disposed top and bottom flanges having openings that arearranged out of alinement with each other, and an insulator-pin passingthrough the openings in both of said flanges and provided intermediatethe points where it passes through said flanges with an offset portion.

4. An insulator-supporting means consisting of a member provided withhorizontally disposed top and bottom flanges having openings that arearranged out of alinement with each other, an insulator-pin passingthrough both of said flanges and consisting of an iron rod that is bentintermediate its ends so as to form an offset portion, and independentmeans on said pin which cooperates with one of said flanges to preventthe pin from moving vertically relatively to said member.

In testimony whereof I hereunto afliX my signature in the presence oftwo witnesses, this fourteenth day of September, 1911.

CHARLES G. ETTE.

lVitnesses:

WALTER C. RAITHEL, EDWARD SoHwIDDE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

